[rrd-users] Re: PREV in 1.0.38 ?

[Darren Kelly]

Hi,

I also need to calculate the deltas between successive values of a DS. As
far as I can tell this should be a matter of using something akin to:
	... DEF:x=testdpk.rrd:myds:LAST CDEF:y=x,PREV(x),- ...

However all this does is generate:
	invalid rpn expression 'PREV(x)'

I'd been playing around with this for a while to no avail when I found
Stanley's email in the archive. I notice that there's been no response to
it. Is there anybody who has successfully used the PREV(x) rpn-operator and
wants to share an example?

Thanks in advance,

Darren Kelly

-----Original Message-----
From: rrd-users-bounce at list.ee.ethz.ch
[mailto:rrd-users-bounce at list.ee.ethz.ch]On Behalf Of Stanley Hopcroft
Sent: 22 August 2002 13:32
To: rrd-users at list.ee.ethz.ch
Subject: [rrd-users] PREV in 1.0.38 ?



Dear Ladies and Gentlemen,

Changelog for rrdtool shows the PREV function in 1.0.39 despite the
1.0.38 docco refrerring to it ...

Does it work in 1.0.38 ?

Yes. Please would you send me an example ?
No.  How could I simulate it             ?

I would like to plot the deltas of GAUGE data.

Yours sincerely.


--
------------------------------------------------------------------------
Stanley Hopcroft
------------------------------------------------------------------------

'...No man is an island, entire of itself; every man is a piece of the
continent, a part of the main. If a clod be washed away by the sea,
Europe is the less, as well as if a promontory were, as well as if a
manor of thy friend's or of thine own were. Any man's death diminishes
me, because I am involved in mankind; and therefore never send to know
for whom the bell tolls; it tolls for thee...'

from Meditation 17, J Donne.

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